Telephone



(ModeL) A. H. HIEATZMAN.

TELEPHONE. No. 257,133. Patented Apr. 25, 1882.

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UNITED STATES PATENT OFFICE.

A. HOWVARD HIEATZMAN, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE- FOURTH TO A. E. DOLBEAR, OF COLLEGE HILL, MASSACHUSETTS.

TELEPHONE.

SPECIFICATION forming partiof Letters Patent No. 257,133, datedApril 25, 1882.

Application filed April 4, 1881. (ModeL) To all whom 'it may concern Be it known that I, A. HOWARD HIEATZ- MAN, a citizen of the United States, residing at Baltimore, in the countyofBaltimore and State Maryland, have invented certain new and useful Improvements in Telephones; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to'which it [0 appertains to make and use the same, reference being bad to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

My invention relates to a resonant augmenter-box of novel construction, into which the sound of the human voice may be delivered, its object being to'augment or magnify the sounds both before their-transmission and after, the better adapting the telephone -for very long lines.

In the drawings hereto annexed, Figure 1 is a perspective view of the box. Fig. 2 is a longitudinal section ofsame. Fig.3 illustrates the application ofthe sound-augmenter box as a transmitter to an ordinary telephone-diaphragm-inclosing case. Fig. 4 illustrates the same applied as a receiver. Fig. 5 illustrates the resonant wires occupying a vertical position before the diaphragm.

The box A is of suitable size, and preferably is larger at one end than at the other, though it may be of uniform size throughout itslength. Within thebox, atoneside,is asounding-board, b, which is secured a half inch or more from 5 the side of the box by a cross-strip, c, at each end. Thisboardinclosesaspace,d. Theboard is provided with a circular hole, I), though this may be dispensed with. The sounding-board may he made-of thin wood or suitable metal.

Vithin and at the opposite side of the box are secured a number ofresonant strings, c, or preferably steel wires, like the fine wires used on pianos. One end of each wire is immovably secured to the cross-strip f, and the other end, by means of the independent screw g, is

secured toacross-strip,f,wl1ich latteris hinged by one edge, h, to the box. The wires are drawn over that edge which is opposite the hinged edge. A tightening-screw, 2', whose thumb-pieceis on the outside ofthe box,passes in shape or not.

through a nut and through the wallor side of the box, and its end bears against that edge of the swinging stripfover which the wires are drawn.

By means of theindependent screwsgthe ten- 5 sion of any one wire may be increased, and by means of the thumb-screw all the wires may be tightened at once.

It will be noticed the wires are not parallel with the sounding-board, but extend in a line which is at an angle therewith. The wires may have this position whether the-box be tapering At the small end is the openin g at which the persons mouth is applied. The sound of the voice enters in a direct line between the sounding-board and wires.

The boxis provided at one end with a flange, 7:, by which it is attached to any ordinary diaphragm-inclosing case, L, immediately before its mouth-piece n and diaphragm p. In order to insure a close connection of the sound-augmenter box to the telephone-ease, a rubber gasket, q, is employed between the flange n and the case. When thus secured the position of the sounding-board is substantially that of a right angle withrespect to the diaphragm 1), whereby the sound of the voice passes across the whole length of the board, and the effect of this device is to give increased distinctness of the voice at the other end of the line.

The angle which the resonant wires occupy with respect to the sound-board may be varied from that shown in Figs. .1 and 2 of the drawings to any other desired angle or position, and they may occupy a vertical position before the diaphragm, as shown in Fig. 5, and, as indicated in the same figure, the resonant wires may be employed without reference to-a soundboard.

It will be understood this is an attachment for ordinary telephones, applicable either as a transmitter or receiver. When used as a receiver the sound issues from the large end, as shown in Fig. 4.

Having described my invention, I claim and 5 desire to secure by Letters Patentof theUnited States- 1. The combination, with a diaphragm, ofa

sound-augmenter box having'an opening at which the mouth or ear may be applied, and a 2 amass number of resonant wires, under tension, secured within the box between the opening and diaphragm, as set forth.

2. A sound-augmenter for telephones, having a number of resonant wires, each capable l of independent adjustment, and a device by her of resonant wires, under tension, secured means of which all the wires may be adjusted within thcbox, anda sounding-board, substanat once, as set forth. tially as set forth.

3. The combination, with a diaphragm, oi'a A. HOWARD HIEATZMAN. sonnd-augmenter boxhavingasounding-board Witnesses:

Whose position is substantially that of a right GHAs. B. MANN, angle with respect to the diaphragm, whereby V. A. NUMSEN.

the sound of the voice passes across the whole length of the board, as set forth.

4. The combination, with a diaphragm, of a sount'i-augmenter box having an opening at which the mouth or ear may be applied, a nmn- 

